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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2009-06-17 15:53:47 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-06-28 13:10:29 +0200 |
| commit | 84261923d3dddb766736023bead6fa07b7e218d5 (patch) | |
| tree | 23a0c4af14dd9c548c5bcb457c74fdd980e2312e /arch/ia64/dig/machvec_vtd.c | |
| parent | KVM: MMU: Allow 4K ptes with bit 7 (PAT) set (diff) | |
| download | linux-84261923d3dddb766736023bead6fa07b7e218d5.tar.xz linux-84261923d3dddb766736023bead6fa07b7e218d5.zip | |
KVM: protect concurrent make_all_cpus_request
make_all_cpus_request contains a race condition which can
trigger false request completed status, as follows:
CPU0 CPU1
if (test_and_set_bit(req,&vcpu->requests))
.... if (test_and_set_bit(req,&vcpu->requests))
.. return
proceed to smp_call_function_many(wait=1)
Use a spinlock to serialize concurrent CPUs.
Cc: stable@kernel.org
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/ia64/dig/machvec_vtd.c')
0 files changed, 0 insertions, 0 deletions